// Copyright (c) Appeon. All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. 
// You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0.

using System;
using Microsoft.Extensions.Caching.Memory;

namespace SnapObjects.Expressions
{
    internal class CacheProvider : ICacheProvider
    {
        private readonly MemoryCache _memoryCache;

        public CacheProvider()
        {
            _memoryCache = new MemoryCache(new MemoryCacheOptions());
        }

        public bool Contains(string key, string sourceKind)
        {
            key = String.Join("/", sourceKind, key);

            return _memoryCache.TryGetValue(key, out var v);
        }

        public void Set<TValue>(
            string key, TValue value, string sourceKind, MemoryCacheEntryOptions entryOptions = null)
        {
            entryOptions = entryOptions ?? 
                new MemoryCacheEntryOptions { SlidingExpiration = TimeSpan.FromMinutes(20) };

            key = String.Join("/", sourceKind, key);

            _memoryCache.Set(key, value, entryOptions);
        }

        public bool TryGet<TValue>(string key, string sourceKind, out TValue value)
        {
            key = String.Join("/", sourceKind, key);

            if (_memoryCache.TryGetValue(key, out value))
            {
                return true;
            }

            value = default;

            return false;
        }
    }
}
